Pusan vs urban center

Pusan and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pusan	Yes	No	No	No
urban center	Yes	No	No	No

Pusan (noun)	urban center (noun)
a city in southeastern South Korea on the Korean Strait; the chief port and second largest city	a large and densely populated urban area; may include several independent administrative districts